Evaluation of intermittent preventive treatment of malaria against group B Streptococcus colonization in pregnant women: a nested analysis of a randomized controlled clinical trial of sulfadoxine/pyrimethamine versus mefloquine

25 Feb 2015
Capan-Melser M, Mombo Ngoma G, Akerey-Diop D, Basra A3, Würbel H, Groger M, Mackanga JR, Zoleko-Manego R, Schipulle U, Schwing J, Lötsch F, Rehman K, Matsiegui PB, Agnandji ST, Adegnika AA, Bélard S, González R, Kremsner PG, Menendez C, Ramharter M

Streptococcus agalactiae constitutes an important cause of neonatal infections in sub-Saharan Africa. Sulfadoxine/pyrimethamine-the current intermittent preventive treatment of malaria in pregnancy (IPTp)-has proven in vitro activity againstgroup B Streptococcus (GBS). Because of specific drug resistance to sulfadoxine/pyrimethamine, mefloquine-an antimalarial without in vitro activity against GBS-was evaluated as a potential alternative. This study assessed the potential of sulfadoxine/pyrimethamine-IPTp to reduce the prevalence of GBS colonization in pregnant women in Gabon when compared with the inactive control mefloquine-IPTp.


Pregnant women participating in a randomized controlled clinical trial evaluating mefloquine-IPTp versussulfadoxine/pyrimethamine-IPTp were invited to participate and recto-vaginal swabs were collected at delivery for detection of GBS colonization. Prevalence of recto-vaginal GBS colonization was compared between IPTp regimens and risk factor and birth outcome analyses were computed.


Among 549 participants, 106 were positive for GBS colonization at delivery (19%; 95% CI = 16%-23%). Prevalence of maternal GBS colonization showed no significant difference between the two IPTp regimens (mefloquine-IPTp: 67 of 366 women = 18%; 95% CI = 14%-22%; sulfadoxine/pyrimethamine-IPTp: 39 of 183 women = 21%; 95% CI = 15%-27%). Risk factor analysis for GBS colonizationdemonstrated a significant association with illiteracy (adjusted OR = 2.03; 95% CI = 1.25-3.30). GBS colonization had no impact on birth outcome, anaemia at delivery, gestational age and birth weight.


Sulfadoxine/pyrimethamine did not reduce colonization rates when used as the IPTp drug during pregnancy. Illiteracy was associated with GBS colonization.